Incoloy® 825 UNS N08825

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It is an alloy that provides high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments. Alloy 825 is similar to alloy 800 but has improved resistance to aqueous corrosion.

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Incoloy 825 (Nickel 825) Strip, Coil, Foil, Wire, AMS 5542, ASTM B424


Description of Incoloy 825

In the oil and gas industry, the two most important nickel alloys are Inconel 625 and Incoloy 825. lncoloy 825 is an austenitic nickel-iron-chromium-molybdenum-copper alloy containing high levels of chromium, nickel, copper and molybdenum to provide high levels of corrosion resistance to both moderately oxidizing and moderately reducing environments. This balance of alloying elements grants this alloy exceptional resistance to both chloride stress corrosion cracking, as well as crevice corrosion and general corrosion. It is the high level of nickel in combination with the amount of molybdenum and copper in this nickel alloy produces substantially improved corrosion resistance in a corrosive environment such as reducing environments compared to stainless steel. The addition of titanium in this alloy also helps to stabilize the alloy against intergranular corrosion. Chloride stress corrosion cracking is a type of localised intergranular corrosion on materials that are put under tensile strength, in high temperatures and in an environment that includes oxygen and chloride ions such as seawater.

As an austenitic, nickel alloy, the material is ductile over a wide range of temperatures from cryogenic to well in excess of 1000 °F (538 °C). Fabricability is typical for a nickel alloy, with the material readily formable and weldable by a variety of techniques.

Chemistry Typical

Nickel: 38.00 - 46.00
Chromium: 19.50 - 23.50
Iron: 22.00 min
Titanium: 0.06 - 1.2
Molybdenum: 2.50 - 3.50
Copper: 1.50-3.00
Carbon: 0.05 max
Manganese: 1.0 max
Sulfur: 0.03 max
Silicon: 0.5 max
Aluminum: 0.2 max

Physical Properties

Density: 0.294 lbs/in3, 8.14 g/cm3

Specific Heat, (32 - 212 ° F), Btu/lb•° F, (0 - 100 °C), J/kg•°C: 0.105 (440)

Mean Coefficient of Thermal Expansion: in/inl° F (mm/ml°C):
70 - 212 ° F (20 - 100 °C): 7.7 x 10-5 (13.9)

Thermal Conductivity: BTU/h-ft-° F (W/m-° K) 70 ° F (21 °C): 6.4 (11.1)

Modulus of Elasticity: ksi (MPa)
28.4 x 103 (196 x 103) in tension

Permeability at 70 ° F (21 °C) H = 200 Oersted :

Annealed : 1.005

Melting Point: 2500 - 2550 ° F (1370 - 1400 °C)


  • Strip
  • Foil
  • Ribbon
  • Profile
  • Round
  • Flat
  • Square

Mechanical Properties of Incoloy 825 at Room Temperature

Annealed Typical

Ultimate Tensile Strength: 85 KSI min (586 MPa min) Yield Strength: (0.2% offset) 35 KSI min (241 MPa min) Elongation: 30% mi


lncoloy® 825 can be cold rolled to various tempers. Contact Ulbrich Technical Service for additional information.

Additional Properties

Corrosion Resistance of Incoloy 825

Refer to NACE (National Associate of Corrosion Engineers) for recommendations.


#1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
#2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process. #2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 - Cold Rolled
#2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. Polished - Various grit finish for specific polish finished requirements. * Not all finishes are available in all alloys - Contact Ulbrich Sales for more information.

Wire Finishes

XC - Extra Clean Bright Annealed or Bright Annealed and Cold Rolled Grease - Ultra bright finish (for decorative applications) Soap - Soap coating on tempered wire to act as lubricant. * Contact Ulbrich Wire for custom wire finishes.

Heat Treatment

lncoloy® 825 cannot be hardened heat treating.

Welding Incoloy 825

For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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